Patent GB-492261-A (GB)
Title: Improvements relating to paper holding means for accounting or the like machines
IPC: B41J11/48
Filed: 1937-02-16
Abstract: 492,261. Typewriters &c. BURROUGHS ADDING MACHINE CO. Feb. 16, 1937, No. 4637. Convention date, Feb. 17, 1936. [Class 100 (iv)] Paper-supports; sheet-feeding arrangements; column-printing arrangements ; line-spacing mechanism.-In a calculating or like machine having general operating-mechanism which runs cyclically, paper-holding means, for instance a platen and feed-rollers, are movable to and from open-throat position by motordriven connections which. are operated independently of the driving-connections for the general operating-mechanism. The mechanism shown in Figs. 3A and 3B is embodied in a computing-typewriter of the kind described in Specifications 18058/07, 18320/08, 18321/08, and 18322/08, [all in Class 106], and comprising a pin-carriage for differentially setting type-carrying racks. The platen P is mounted in a frame 30 supporting a rocking plate 32 which is secured to a rock-shaft 33 on the carriage 34. Feed-rollers 40 co-operating with the platen are mounted on a shaft 42 carried by spring-urged arms 43. The platen is raised into front-feed position by means of a rocking yoke 94 having rollers 96, 97 engaging the plate 32. The yoke is connected to a link 92 having a pin 91 co-operating with a cam 90 mounted on a shaft 82. A collar 84 fast on the shaft is provided with a clutch-pin for engaging a clutch-member 83 on a loose bevelwheel 81 driven by a shaft 80 which is driven by the machine-motor. A rocker 86 controlling the clutch-pin co-operates with cams 87, 89 on an arm 88 secured to a rock-shaft 60 in connection with a link 57 which rests on a lug 55 on a link 54 carried by a lever 52. When a cam 50 on the carriage 34 engages a roller 51 on the lever, the link 57 is raised and, near the end of a cycle, a rock-arm 61 advances the link, and the shaft 60 is rocked and is retained by co-operation of a latch 72 with a plate 70 on the shaft. The shaft depresses by means of linkage 74, 75 a link 77 for closing, if necessary, the motor-switch. The shaft also releases the cam 87 from the rocker 86, and the shaft 82 after making a half-revolution is arrested by co-operation of the cam 89 with the rocker. The cam 90 moves with the shaft and raises the link 92, the yoke 94 being thereby caused to raise the platen into frontfeed position. Towards the end of the movement, one of the arms 43 is obstructed by a stud 111, and the feed-rollers 40 are separated from the platen to provide a throat. The stud 111 is normally ineffective and is moved into obstructing position by means, described below, in connection with the linespacing bail 164. The cam 50 is preferably so placed as to become operative when a total is printed. During return of the carriage, the throat remains open and the motor continues running. When the first amount-key is depressed, preparatory to the typing of the new sheet, the escapement-bar 120 for the pin-carriage is raised, a pin 121 thereon rocks a bail 123 for releasing the latch 72, and the shaft 60 is returned by a spring 71. Thereupon, the motor-switch is opened, the shaft 82 is turned a half-revolution by momentum, the cam 90 permits the platen and feed-rollers to return to normal position, and the cam 87 then disengages the clutch. The inertia of the motor causes the platen to return without noise or jar. To ensure return of the platen if the motor is sluggish, the collar 84 is provided with a disc 130 having a notch 131 cooperating with a pin 132 on a spring-urged yoke 134 which co-operates with a latch 137 having a shoulder 139 for engaging the switch-control link 77. After the switch has been closed by depression of the link 77, the pin 132 drops, the latch 137 engages the link and release thereof with consequent opening of the switch, is delayed until part of the second half-revolution of the disc 130 has occurred, whereupon another notch in the disc permits the pin to drop and release the latch. An adjustable masking- plate for the last-mentioned notch controls the timing of the switch. Line-spacing is effected, as an incident to total-taking, by means of a pawl 167 co-operating with a ratchet-wheel 168 on the platen P. The pawl is carried by the bail 164 which is mounted on the carriage 34 and engages a fork 162 on a lever 160. A slide 156 connected to the lever carries a pivoted arm 154 having a pin 153 engaging a bell-crank 151 which rests on a lug 150 on the link 54. Immediately the link is raised, the arm 154 is moved into the path of a stud 157 which is depressed and returned during the latter part of a cycle, the pawl 167 being thereby caused to effect line-spacing before the platen is raised. For causing the bail 164 to raise the stud 111 into position to obstruct the feed-roller arm 43, the slide 156 is provided with a pin 155 for engaging a notch 176 in a link 174 connected to a yoke 175 having a pin 177 for co-operating with a cam 178 on the shaft 82. The link 174 engages a pin 173 on a rock-arm 171 in connection with a link 170 which rests on a lug 56 on the link 54 and co-operates with the rock-arm 61. After the line-spacing operation, the link 170 causes the link 174 to engage the pin 155, the cam 178 rocks the yoke 175 the slide 156 is depressed, and a pin 180 on the bail 164 lifts the arm 112 carrying the stud 111. To permit of inspection of the work, the platen can be raised automatically or by means of a key 200, without opening the feed-throat. For automatic control, the carriage is provided with a small cam 190 arranged to raise the link 54 sufficiently to bring the link 57, but not the link 170, into the path of the rock-arm 61. The cam 190 initiates platen-raising in the above described manner, but does not cause the stud 111 to move into position for releasing the feedrollers 40. The key 200 is connected by a bell-crank 202 and link 205 to the plate 70 on the shaft 60. Depression of the key rocks the shaft 60 and causes the motor to raise the platen but since the link 54 is not raised, the pin 111 remains stationary and the feedrollers are not separated from the platen. The latch 72 retains the platen in raised position. When the key is again depressed, a pin 211 on a bell-crank 212 pivoted on the bell-crank 202 releases the latch, and the platen returns to normal position. Sheet-clamping arrangements.- When the platen is raised to permit of inspection of the work, the sheets are prevented from falling forward by means of pivoted clamps or fingers 221, Fig. 3A, which are normally at the sides of the sheets and are automatically swung inwards when the platen is so raised. For this purpose, each finger has a part 222 co-operating with an arm 223 on a shaft 224 which is provided with a crank-pin 226 cooperating with an incline 227 on a lever 288 in connection with a bell-crank 231 abutting on a pin 233 on the line-spacing bail 164. When the platen is raised for work-inspection. the bail remains stationary, and the fingers are swung inwards. The shaft 224 is provided with an automatically and manually-releasable latch. When the platen is raised and the throat is opened, the fingers are not swung inwards, since the bail removes the stud 233 from the bell-crank 231, and the incline 227 is thereby rendered ineffective. Platen-shift mechanism.-The platen-frame 30 can be slid forward, under control of a shift-key 280, but is normally prevented from sliding by means of a latch 102 pivoted on the carriage 34 and having an L-slot 105 engaging a pin 106 on the platen-frame. The latch is normally locked by a slide 107 in connection with a bail 305 on the carriage. The shiftkey is connected to a loose arm 282 which engages a crank-pin 283 on the shaft 60 and has a lug 285 engaging a yoke 286. A bellcrank 288 co-operating with the yoke engages a grooved collar 292 carrying the cam 90, a hole therein being engaged by a pin 293 on a cam 294 secured to the shaft 82. The cam 294 is smaller than the cam 90 and normally does not engage the pin 91. The yoke 286 has an arm 300 in connection with a lever 303 engaging the bail 305. When the shift-key is depressed, the shaft 60 is rocked, the clutch 83 is closed, the collar 292 is displaced, the cams 294, 90 are moved into and out of engagement with the pin 91 and the bail 305 is caused to release the latch 102. During the first half-revolution of the shaft 82, the cam 294 raises the slide 92, the yoke 94 is rocked, and the platen-frame is slid forward for shift. According to the Specification as open to inspection under Sect. 91, the platen-mechanism may be so controlled that the platen is raised and the feed-throat is opened only after a positive or negative total-taking operation. For this purpose the link 54 has pin and slot engagement with the lever 52, and is normally restrained by a latch. When the carriage enters a total column, the lever is raised, and a spring in connection with the link is stretched. On depression of the positive-total key the latch is released, the link is raised, and the platen-mechanism is operated. When the negative-total key is depressed, the extendplate causes the machine to make almost two cycles before the total-taking means is conditioned, and during the third cycle the latch for the link 54 is released and the platenmechanism is operated. This subject-matter does not appear in the Specification as accepted.